Wednesday, December 29, 2010
SSAS: What is Linked Dimension ?
In SQL Server Analysis Services (SSAS), Linked Dimension is a dimension which is existed in other analysis services DB. It may exist in same or different server. it helps the user to keep the common dimension in multiple database.
Tuesday, December 28, 2010
What is Conformed dimension?
Conformed dimension is a dimension that has a single meaning or content throught datawarehouse.we can use it accross the fact tables
Example: Time, Product, Staff Dimensions are Conformed dimension, it is shared across multiple fact tables.
Example: Time, Product, Staff Dimensions are Conformed dimension, it is shared across multiple fact tables.
What is Role Playing dimension?
Role Playing dimension is a dimension, it can play different roles in a fact table depending on the context.
For example: Date dimension
Date dimension can be used for ordered date, shipping date, shipment date, and invoice date, etc., in an order line fact.
In the data warehouse, you will have a single dimension table for the dates. You will have multiple warehouse foreign key from the fact table to teh same dimension.
For example: Date dimension
Date dimension can be used for ordered date, shipping date, shipment date, and invoice date, etc., in an order line fact.
In the data warehouse, you will have a single dimension table for the dates. You will have multiple warehouse foreign key from the fact table to teh same dimension.
What is junk dimension?
A junk dimension is a collection of random transcational codes flags and text attributes that are unrelated to any particular dimension.The junk dimension is simply a structure that provides the convienent place to store the junk dimension.
Monday, November 29, 2010
Operational Data Store Vs Data warehouse
Operational Data Store(ODS) | Data warehouse |
ODS is an Online integration of data | Typically it won't provide online Information. It provides offline data. |
ODS is used, when a system's data is required to access from some other systems immediately. Ex: records updated from various section, data is lying in different DB, of Hospital is required while billing or some other activities | It is used while making decisions from past and present data(bit old, may be data taken from hours or days back) |
ODS is centralized repository of data for online operational use | This is Non-Operational use |
What is Data warehouse?
Data warehouse is repository of data, which are collected from many sources like transactional database or old backup data, etc., and then filtered, cleansed, transformed the data for the purpose of analyzing, decision making and reporting.
Subscribe to:
Posts (Atom)